A boiler produces \(1200 \mathrm{~kg}\) of steam \(/ \mathrm{h}\) at a pressure of \(10 \mathrm{bar}\) and temperature of \(200^{\circ} \mathrm{C}\). Coal consumed during same period is \(150 \mathrm{~kg}\). Feed water temperature is \(46^{\circ} \mathrm{C}\). C.V. of coal is \(45000 \mathrm{~kJ} / \mathrm{kg}\). Calculate equivalent evaporation from and at \(100^{\circ} \mathrm{C}\) and boiler efficiency.
Take \(c_{p s}=2.1 \mathrm{~kJ} / \mathrm{kg} . K\) and \(c_{p w}=4.187 \mathrm{~kJ} / \mathrm{kg} . K\).